package com.hmdp.Interpretor;

import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.utils.UserHolder;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
////        1、获取session
//        HttpSession session = request.getSession();
////        2、获取session中的用户
//        Object user = session.getAttribute("user");
//
//        if (user == null) {
//            //不存在，拦截，返回401状态码
//            response.setStatus(401);
//            return false;
//        }
//        //存在，保存用户信息到Threadlocal
//        UserHolder.saveUser((UserDTO)user);
//        return true;
        // 1.判断是否需要拦截（ThreadLocal中是否有用户）
        if (UserHolder.getUser() == null) {
            // 没有，需要拦截，设置状态码
            response.setStatus(401);
            // 拦截
            return false;
        }
        // 有用户，则放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
            //移除用户
        UserHolder.removeUser();
    }
}
